Significant Subsidiaries (Details) (Chestnut Apartments [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Chestnut Apartments [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	$ 1,657,643	$ 1,498,853
Total Liabilities	385,170	751,978
Revenue	214,018	215,679
Net Income	$ 54,916	$ 52,342